3 ms·
In schematic.png you can see on the left there are 3 pins and the right there are 2 pins. The 3 pins on the left represent the laptop and the two pins on the ri
by zelon88 5y ago
In schematic.png you can see on the left there are 3 pins and the right there are 2 pins. The 3 pins on the left represent the laptop and the two pins on the right represent the power supply. The chip in the middle attaches to the ID pin on the laptop and reports the charger to the laptop.
- tgflynn 5y agoYes, I was confused because my Dell laptop power input doesn't have 3 wires (unless there's somehow a third wire buried in the barrel connector), so I was assuming that the ID signal is somehow just combined with the actual input voltage.
- camtarn 5y agoYes, the barrel connector actually has three contacts. The inner and outer part of the metal barrel are insulated from each other - the outer is ground and the inner is +V. The pin in the middle only carries data.
- tgflynn 5y agoThanks, that's useful information that I haven't seen anywhere else.